"This thick, rubberized self-sinking air line maximizes air flow between the windmill and air compressor and air diffusers. U.S.A. Product Type Windmill accessory, Accessory Type Lines and tubing, Application Air line, Length ft. 100, Includes qty. 1 air line, Material Type Rubber, Compatible With All aeration systems, Size in. 1/2. Thick, rubberized, self-sinking air line maximizes air flow between the windmill air compressor and air diffusers Tube is weighted to keep air line on the bottom of pond Prevents tangling with fishing line, boat motors and more Works with all aeration systems 1/2in. line 100 feet total"